Reversing control for grinding machines



A. c. KRULL. I REVERSING CONTROL FOR GRINDING MACHINES.

APPLICATION FILED DEC-5. I921.

1,427,756. I BatentedAng'. 29, 1922..

2 SHEETS-SHEETI.

Inuenfox" fiuguai GKruII A. C. KRULLL RLEVERSING CONTROL FOR GRINDING MACHINES. I APPLICATION FILED DEC. 5. 19 21. 1,427,756. I v Patented Aug. 29, 1922 I Inuanfor' fluciusf GKruH lg 5 UNITEDJ STATES PATENT OFFICE.

AUGUST CHARLES KRULL, OF GRAND RAPIDS, MICHIGAN, ASSIGNOR, BY MESN'E ASSIGNMENTS, TO MACHINERY COMPANY OF AMERICA, OF BIG RAPIDS, MICH- IGAN, A CORPORATION OF MICHIGAN.

REVERSIN'G CONTROL FOR- GRINDING MACHINES.

Specification of Letters Patent.

Patented Aug. 29, 1922.

Application filed December 5, 1921. Serial No. 519,893.

.Machines; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it app'ertains to make and use the same.

This invention relates to a reversing control mechanism for grinding machines. In thetype of machine to which it is to be applied, the mechanism for driving the table carrying the work acted upon by the grind ing wheel is located substantially directly under the grinding wheel, and it is very desirable that this mechanism shall be completely housed and covered so that materials given off from either the grindingwheel or the work acted upon during the operation of the machine shall not come into contact with such mechanism, the result of which is a cutting and wearing of the mechanism, particularly gearing used, so that it becomes injured and worn out earlier than other- It is a primary object and purpose versing control which may be applied to the machine and passdownwardly through the housing for the table driving mechanism without leaving any'opening whereby dirt, water, grit, iron or steel waste from the workyand the like can get to such mechanism. Affurther object of the invention is to construct this mechanism. for reversal of the grinding table so that the reversal of movement of the table or the stopping of gmovement thereofhat any time may be very quickly and easily accomplished manually. Various other objects and purposes, relating to simplicity of construction and economy of manufacture will appear as understanding of the inventionis had from the following description, taken in connection with the accompanying drawings, in which,

Fig. 1. is-a sideelevationof a grinding machine equipped with my invention, a part of the pedestal housing being broken away and shown in section for better disclosure of 'the. interior mechanism.

2 is a horizontal'section on the plane of l ne 22, of Fig. 1.

F gs; 3 and 4: are fragmentary horizontal sections on the planes of lines 3'-3, and 14, of Fig. 1.

Fig. 5 is a fragmentary vertical section taklen on the plane of line 55, of Fig. 4, BBC

Fig. 6 is a fragmentary enlarged horizontal section through the inner end of the belt shifting rod, forming one element of the grinding machine mechanism.

Like reference characters refer .to like parts in the different figures of the drawings.

In the construction of the grinding machine, a hollow vertically positioned housing pedestal 1 is used on which, at the upper end and front portion thereof a stationary supporting and guide member 2 is fixed, the work carrying table 3 being slidably mounted thereon. At the rear portion of the upper end of the pedestal, a supporting bracket 4 is secured having two spaced apart arms 4 and 1", on which a shaft is mounted, the front end thereof carrying a grinding wheel 5 back of the work holding table. This shaft may be driven by a belt from any suitable line shaft going around the pulley 6. The rear end of the shaft is provided withan elongated pulley 7 of small diameter around which two'belts 8 and 9 are passed. These belts extend downwardly to pass around two of the three pulleys 10, 11 and 12, the former of which is fixed on a shaft 13 and the latter two of which are looseon said shaft. Shaft 13 passes through an elongated'bearing member 1 1 therefor whichis fixed to. and projects from the pedestal 1, the shaft at its front'end passing into the pedestal. A shifting rod 15 is slidably mounted through the endof an arm 14 projecting from the member 14: and at'itsrear end carries two shiftingarms 15, one of which is operatively connected with each belt 8 and 9. In the position of the belts 8 and 9, shown in Fig. 1, the belt 9 drives the fixed pulley 10 and the belt 8 the loose pulley 12 in one direction. When shifted to the other position, belt 8 drives the fixed pulley 10 and belt9 the loose pulley 11 in the op- 9 as is evident. The shifting rod 15 exinner end.

tends into the pedestal 1 and is there operated by mechanism which will be later described.

Shaft 13, within the pedestal 1 is equipped with a worm 16 in mesh with a worm or tangent wheel 17 fixed on a shaft 18 which extends vertically to and through the upper side of the pedestal, having a gear 19 fixed at its upper end above the upper side of the pedestal. Gear 19 is substantially covered by a housing 20 bolted to the upper side of the pedestal. This housing is cut away at its front side so that the gear partially projects therefrom to mesh with a rack 21 secured to the rear side of the work carrying table '3.

Two rearwardly projecting studs :22 are adjustably secured in spaced apart relation on the rear side of the table 3 and in the movements of the table back and forth come into contact engagement with a member 23 which is adjustably connected to a lever 24. by means of a pin and slot connection, indicated at 25, both parts 23 and 24k being-pivotally mounted on a stud 26 inserted into the upper side of the housing 20. The lever 21 has its outer portion longitudinally slotted, making a slot 27 into which a pin 28 carried on an arm 29 projects, the arm being fixed to a vertical rod 30 which passes downwardly through the upper side of the pedestal 1 and has rotative hearings in a boss 31 on the pedestal and in a bearing 31 secured to an inner side of the pedestal. A pin 3'2 extends laterally from the rod 30 near its lower end and passes through an opening 33 made through the shifting rod 15 near its Rod 30 extends upwardly substantially to the upper side of the grinding wheel 5 and is equipped with a hand wheel 34 at its upper end whereby it may be turned back and forth manually, whenever desired. 'The driving of shaft 13 and from it the shaft 18causes a longitudinal movement. of the table 3 which continues until a stud 22 strikes against the member 23, turning it about the axis of the screw stud 26 and through the connections described operates rod. .30 to give it a partial turn, thereby shifting the rod 15 a distance suiiicient to reverse the direction of turning of shaft 13, with the result that the table 3 is moved back in the opposite direction until the other stud 22 strikes the member 23 and rod 15 is again shifted for reversal of the movement of the work carrying table 3. I

With this construction, there is a complete covering of the drive mechanism and gearing housed within the pedestal 1 and water, grit, metal dust and grindings and the like are excluded completely from the pedestal and cannot get thereinto to injure the mechanism housed within the same. At the same t me the hand wheel 34 is readily accessible to the operator of the machine who, by turning the same may either stop the movement of the table or reverse its direction of movement at any time irrespective of the position of the table in its travel.

The invention is very practical and in service has proved its merit. The appended claims define the invention and I consider the invention to comprehend all forms of construction coming within the scope of .said claims.

I claim:

1. In a rinding machine, a hollow pedestal, a WO1{ table mounted for reciprocation, means for driving the work table including shiftable belts for changing the direction of operation of said. driving means, a verti cally positioned rod passing into the upper end of the pedestal, means connected with the rod and operable by the movement of the table for partially turningit back and forth at predetermined stages in the movement of the table, a shifting rod operatively connected with the belts, and connections'between said vertical rod and shifting rod for operating the shifting rod on turning the vertical rodsubstantially as described.

2. A constructioncontaining the elements in combination defined in claim 1 combined with a hand wheel attached to said vertical rod for manual operation thereof, substantially as describec.

3. In a grinding machine, a hollow pedestal, awork table mountedfor reciprocation above the pedestal, a drive shaft, two loose and one fixed pulley on the shaft, shiftable belts adapted to drive the fixed pulley and one of the loose pulleys at a time, a shifting rod operatively connected with the belts and extending into the pedestal at one side, a vertical rod mounted in and extending through the upper side of the pedestal, a finger or pin extending from the vertical rod through the shifting rod, means for driving the table from the drive shaft, and means connected with the vertical rod and operated by the table for automatically turn ing the rod to shift the belts at predetermined points in the travel of the table. A

4. In a grinding machine, a hollow pedestal, a work carrying table mounted for reciprocation above the pedestal, a drive shaft, two fixed pulleys and a loose pulley on the shaft, shiftable belts for driving the fixed pulley and one of the loose pulleys at a time, one of the belts driving the fixed pulley in a direction opposite to that of the other, a shifting rod operatively connected with the belts and extending into the pedestal at one side thereof, a'vertical rod rotatably mounted within the pedestal and extending upwardly through the upper side thereof, a pin on the vertical rod passing throughjthe shifting rod, a vertical shaft in the pedestal, a worm wheel'thereon, a worm on the drive shaft driving the worm wheel, a gear fixed on the upper end of the vertical shaft, a rack on thetable with which said gear has engagement, an arm extending from the vertical rod, a pin projecting from the arm, a bell-crank lever pivotally mounted above the pedestal, one arm thereof having a slot therein into which said pin extends, and the other arm extending toward the table, and studs on the table one at each side of said arm of the bell-crank lever, adapted to engage therewith, substantially as and for the purposes described.

5. In a grinding machine, a pedestal, a Work table mounted for reciprocation above the pedestal, means for driving the work table including gearing mechanism housed of the pedestal, and means for turning the rod in opposite directions with opposite directions of movement of the table, and at.

predetermined points in the travel of the work table, to thereby move the shifting rod and shift the belts, substantially as described.

In testimony whereof I aflix my signature.

AUGUST CHARLES KRULL. 

